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Many times those results are achieved with a "walking the cup" technique. The non conductive gas cup can ride on the weld joint and pivot on alternating sides of the weld to give the consistent pattern pictured.
The super consistent gold and blue colors take practice. Heat is collecting on the parts with weld time. More heat, more pedal, is applied at the start of the weld and is slowly tapered off as the weld continues.

Fuck yeah. The lens is worth the extra cash. Nice choice.
I saw a youtube of a Taiwanese welder walking the cup on a big stainless pipe. Big like 18 inch OD. The speed and consistency was remarkable.
